TAILIEUCHUNG - Modified Binh Thuan bentonite as an efficient and recyclable catalyst for the suzuki reaction between iodobenzene and phenylboronic acid

The reaction was performed using mol% catalyst at 100o C in dimethylformamide (DMF) and in the presence of K3PO4 as a base, with biphenyl being formed in a conversion of up to over 95% (GC) without added phosphine ligands. It was also observed that the modified bentonite catalyst could be facilely separated from the reaction mixture by centrifugation or simple filtration, and could be reused in subsequent reactions without significant degradation in activity. | Journal of Chemistry, Vol. 46 (4), P. 509 - 514, 2008 MODIFIED BINH THUAN BENTONITE AS AN EFFICIENT AND RECYCLABLE CATALYST FOR THE SUZUKI REACTION BETWEEN IODOBENZENE AND PHENYLBORONIC ACID Received 7 December 2007 PHAN THANH SoN NAM, TRuoNG NGUYeN THuY Vu, TRuoNG Vu THANH Hochiminh University of Technology SUMMARY Modified Binh Thuan bentonite catalyst was prepared by exchanging with aqueous solution of PdCl2, affording a catalyst loading of mmol of Pd/g (ICP-MS). The Pd2+-exchanged bentonite catalyst was assessed for its activity in the the Suzuki cross-coupling reaction between iodobenzene and phenylboronic acid to form biphenyl as the principal product. The reaction was performed using mol% catalyst at 100oC in dimethylformamide (DMF) and in the presence of K3PO4 as a base, with biphenyl being formed in a conversion of up to over 95% (GC) without added phosphine ligands. It was also observed that the modified bentonite catalyst could be facilely separated from the reaction mixture by centrifugation or simple filtration, and could be reused in subsequent reactions without significant degradation in activity. I - INTRODUCTION Transition metal-catalyzed cross-coupling reactions have attracted interests over the past thirty years in organic synthesis, in particular as convenient techniques for the formation of carbon-carbon bonds [1]. Numerous reactions have been developed to achieve cross-coupling, of which the Suzuki reaction is one of the most efficient methods for the synthesis of biaryl derivatives [2]. These biaryl units have exhibited practical applications in the production of pharmaceuticals, herbicides, as well as engineering materials such as conducting polymers and liquid crystals [3]. Catalysts used in the standard Suzuki processes are generally based on homogeneous palladium phosphine complexes, which are rarely recoverable without elaborate and wasteful procedures, and therefore commercially undesirable. Phosphine ligands are .

• Hoá học
• Journal of Chemistry
• Modified Binh Thuan bentonite
• Efficient and recyclable catalyst
• The suzuki reaction between iodobenzene and phenylboronic acid
• The modified bentonite catalyst
• Journal of technology and science education
• Innovative chemistry learning model
• Improving the critical thinking skill
• Self efficacy of pre service chemistry teachers
• Pre service chemistry teachers
• SCT learning model syntax covers
• The Chemistry and Antimicrobial Activity of Psychotria reevesii Wall
• The Chemistry and Antimicrobial Activity
• Psychotria reevesii Wall
• The polar fractions against Staphylococcus aureus
• The relationship between teacher related factors
• Students attitudes towards secondary school chemistry subject
• Bureti district Kenya
• Secondary school chemistry subject
• Click chemistry
• Poly(ethylene glycol)
• Poly(epsilon caprolactone)
• Azide functionalized molecules
• Azide montmorillonite clay
• Block copolymer
• Ketene chemistry
• Telechelic polymers
• Controlled radical polymerization (CRP)
• C60 fullerene
• Metallosupramolecular chemistry
• Host–guest complexes
• Supramolecular chemistry
• Donor–acceptor (D–A)
• Ring opening polymerization
• Thiol benzoxazine reaction
• Catechol based benzoxazine copolymer
• Antibacterial coatings
• Benzoxazine chemistry
• Green chemistry
• Heavy metals
• Cetylpyridinium chloride
• Analytical chemistry
• Journal of Science and Technology
• Green organic synthesis of N methylpyrrolidine
• Gas Chromatography Mass spectroscopy
• The green chemistry process
• Via the green chemistry process
• Journal of medical research
• Production of liophilized quality control samples
• Liophilized quality control samples
• Several clinical chemistry test
• Statistical quality control
• Perspectives on blended learning
• The on line platform
• LabLessons for Chemistry
• Hydrogen and Titration
• College mentors alongside
• Contextualizing technology in the classroom via remote access
• Using space exploration themes
• Scanning electron microscopy
• Tools to promote engagement
• Multidisciplinary geology chemistry experiments
• The service of learning chemistry in Industrial Engineering
• Degrees in Industrial Engineering
• Chemical Engineering and Materials Engineering
• The feed back
• Assessment of achievement in problem solving skills
• General Chemistry course
• Problem based learning
• Measure problem solving skills
• Use of chemistry software to teach
• Assess model based reaction and equation knowledge
• Assess model based reaction
• Two advanced placement
• Public suburban high school
• Collaborative activities for solving multi step problems
• Solving multi step problems in general chemistry
• Solving multi step problems
• The relatve partcipaton of instructor students
• Antioxidant activity
• Bioinorganic chemistry
• Cytotoxic activity
• DNA binding and cleavage activity
• Topoisomerase inhibitor
• Transition metal compounds
• Analytical methods
• Electroanalytical chemistry
• Ionic liquids
• Penicillin allergic patients
• Capillary electrophoresis
• Carbamate SCC interactions
• Fluorescence quenching
• Quantum chemistry calculation
• Inhibition chemiluminescence
• Piperazine chemistry
• Structural features
• Anticancer activity
• Anticancer drugs
• D cyclin dependent kinase
• 3 Amino 9 ethylcarbazole
• Multicomponent reaction
• Arylation reactions
• Cyclization reactions
• Pyrrolo[2 3 c]carbazole
• Prido[3 2 b]carbazole
• Ionic liquid
• Organic phase change materials
• Thermal energy storage
• Solvent free medium
• Silicon chemistry
• Reaction mechanism
• Density functional theory (DFT)
• Homogeneous transitionmetal catalysis
• Silicon analogues
• Medicinal chemistry
• Antiproliferative agents
• Protect endangered tissue
• Anti inflammatory cytokines
• Persistent inflammatory reaction
• Formic acid decomposition
• Renewable feedstock
• Energy feedstocks
• High surface area materials